ASSE 6010 Medical Gas Systems
Installer Practice Exam 100 Questions
And Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A
Instant Download Pdf
1. When is the initial pressure test conducted by the medical gas installer?
After blowdown of the distribution piping.
Rationale: NFPA 99 requires that initial pressure testing of medical gas and
vacuum distribution piping be conducted after the initial piping blowdown
has been completed, but before installation of station outlet/inlet rough-in
assemblies and other system components that could be damaged by test
pressure.
2. What treatments shall be performed before brazing cut ends of a tube to
be installed in a medical gas piping system?
Cut ends may be rolled smooth or deburred.
Rationale: NFPA 99 requires that burred ends of all tubing be deburred using
a deburring tool to the full bore of the tube, and all chips shall be removed.
This prevents flow restriction and particulate contamination in the piping
system.
3. What is the purpose of using an oxygen analyzer during the piping purge
prior to brazing?
To assure that all ambient air has been removed from the pipeline.
Rationale: During brazing, the piping must be continuously purged with oil-
free, dry nitrogen NF to prevent the formation of copper oxide on the inside
,surface of the joint. An oxygen analyzer verifies that ambient air has been
adequately displaced from the pipeline before brazing begins.
4. Who shall witness the installer perform both standing pressure test and
standing vacuum test?
The authority having jurisdiction or its designee.
Rationale: NFPA 99 requires that standing pressure tests and standing
vacuum tests be witnessed by the authority having jurisdiction or their
designated representative to ensure compliance with testing protocols.
5. The medical air compressor intakes shall be located a minimum of how
many feet from any exhaust or plumbing vents?
25 feet.
Rationale: NFPA 99 requires medical air compressor intakes to be located a
minimum of 25 feet from any exhaust or plumbing vents to prevent
contamination of the medical air supply with exhaust gases or sewer gases.
6. The gas produced by evaporation from the secondary header in a cryogenic
liquid cylinder system shall enter the supply system ___ of the final line
regulator.
Upstream.
Rationale: In cryogenic liquid cylinder systems, gas from the secondary
header must enter the supply system upstream of the final line regulator to
ensure proper pressure regulation and mixing before delivery to the pipeline.
7. With the approval of the authority having jurisdiction, a zone valve shall be
permitted to be secured to prevent inappropriate access in which areas?
Psychiatric or pediatric areas.
Rationale: NFPA 99 permits zone valves to be secured in psychiatric or
pediatric areas with AHJ approval to prevent patients or unauthorized
individuals from tampering with the medical gas system.
8. Factory installed inlet tubes on station outlets shall be not less than ___
with 0.3 inch inside diameter.
, NPS 1/4 in, 3/8 in. O.D.
Rationale: NFPA 99 specifies minimum dimensions for station outlet/inlet
factory-installed tubing to ensure adequate flow capacity. Runouts and
connecting tubing for gauges and alarm devices are permitted to be DN8
(NPS 1/4) (3/8 inch O.D.).
9. Which operation would NOT reach the vacuum system?
Testing a system component with a leak detector solution.
Rationale: Testing with leak detector solution is a non-invasive procedure
that does not require breaching the piping system. Addition, removal, or
replacement of system components creates a breach that must be inspected
and tested.
10. Medical gas piping shall not be installed in which of the following
locations?
Kitchens, stairwells, elevator shafts, and elevator machine rooms.
Rationale: NFPA 99 prohibits medical gas piping installation in kitchens,
stairwells, elevator shafts, elevator machine rooms, areas with open flames,
and areas with electrical service equipment over 600 volts due to fire and
safety hazards.
11. What is the required test pressure for medical gas and vacuum systems?
1.5 times the system operating pressure, but not less than 150 psi gauge
pressure.
Rationale: NFPA 99 requires that the test pressure for pressure gases and
vacuum systems be 1.5 times the system operating pressure, with a minimum
gauge pressure of 150 psi. This pressure must be maintained until each joint
is examined for leakage.
12. What type of gas shall be used as the test gas for medical gas piping?
Oil-free, dry nitrogen NF.
Rationale: NFPA 99 specifies that the test gas for medical gas and vacuum
systems shall be oil-free, dry nitrogen NF (National Formulary grade) to
prevent contamination of the oxygen-clean interior of the piping.
Installer Practice Exam 100 Questions
And Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A
Instant Download Pdf
1. When is the initial pressure test conducted by the medical gas installer?
After blowdown of the distribution piping.
Rationale: NFPA 99 requires that initial pressure testing of medical gas and
vacuum distribution piping be conducted after the initial piping blowdown
has been completed, but before installation of station outlet/inlet rough-in
assemblies and other system components that could be damaged by test
pressure.
2. What treatments shall be performed before brazing cut ends of a tube to
be installed in a medical gas piping system?
Cut ends may be rolled smooth or deburred.
Rationale: NFPA 99 requires that burred ends of all tubing be deburred using
a deburring tool to the full bore of the tube, and all chips shall be removed.
This prevents flow restriction and particulate contamination in the piping
system.
3. What is the purpose of using an oxygen analyzer during the piping purge
prior to brazing?
To assure that all ambient air has been removed from the pipeline.
Rationale: During brazing, the piping must be continuously purged with oil-
free, dry nitrogen NF to prevent the formation of copper oxide on the inside
,surface of the joint. An oxygen analyzer verifies that ambient air has been
adequately displaced from the pipeline before brazing begins.
4. Who shall witness the installer perform both standing pressure test and
standing vacuum test?
The authority having jurisdiction or its designee.
Rationale: NFPA 99 requires that standing pressure tests and standing
vacuum tests be witnessed by the authority having jurisdiction or their
designated representative to ensure compliance with testing protocols.
5. The medical air compressor intakes shall be located a minimum of how
many feet from any exhaust or plumbing vents?
25 feet.
Rationale: NFPA 99 requires medical air compressor intakes to be located a
minimum of 25 feet from any exhaust or plumbing vents to prevent
contamination of the medical air supply with exhaust gases or sewer gases.
6. The gas produced by evaporation from the secondary header in a cryogenic
liquid cylinder system shall enter the supply system ___ of the final line
regulator.
Upstream.
Rationale: In cryogenic liquid cylinder systems, gas from the secondary
header must enter the supply system upstream of the final line regulator to
ensure proper pressure regulation and mixing before delivery to the pipeline.
7. With the approval of the authority having jurisdiction, a zone valve shall be
permitted to be secured to prevent inappropriate access in which areas?
Psychiatric or pediatric areas.
Rationale: NFPA 99 permits zone valves to be secured in psychiatric or
pediatric areas with AHJ approval to prevent patients or unauthorized
individuals from tampering with the medical gas system.
8. Factory installed inlet tubes on station outlets shall be not less than ___
with 0.3 inch inside diameter.
, NPS 1/4 in, 3/8 in. O.D.
Rationale: NFPA 99 specifies minimum dimensions for station outlet/inlet
factory-installed tubing to ensure adequate flow capacity. Runouts and
connecting tubing for gauges and alarm devices are permitted to be DN8
(NPS 1/4) (3/8 inch O.D.).
9. Which operation would NOT reach the vacuum system?
Testing a system component with a leak detector solution.
Rationale: Testing with leak detector solution is a non-invasive procedure
that does not require breaching the piping system. Addition, removal, or
replacement of system components creates a breach that must be inspected
and tested.
10. Medical gas piping shall not be installed in which of the following
locations?
Kitchens, stairwells, elevator shafts, and elevator machine rooms.
Rationale: NFPA 99 prohibits medical gas piping installation in kitchens,
stairwells, elevator shafts, elevator machine rooms, areas with open flames,
and areas with electrical service equipment over 600 volts due to fire and
safety hazards.
11. What is the required test pressure for medical gas and vacuum systems?
1.5 times the system operating pressure, but not less than 150 psi gauge
pressure.
Rationale: NFPA 99 requires that the test pressure for pressure gases and
vacuum systems be 1.5 times the system operating pressure, with a minimum
gauge pressure of 150 psi. This pressure must be maintained until each joint
is examined for leakage.
12. What type of gas shall be used as the test gas for medical gas piping?
Oil-free, dry nitrogen NF.
Rationale: NFPA 99 specifies that the test gas for medical gas and vacuum
systems shall be oil-free, dry nitrogen NF (National Formulary grade) to
prevent contamination of the oxygen-clean interior of the piping.
